Method and apparatus for transmitting and receiving information for providing plurality of communication services

ABSTRACT

An example communication method in a terminal of a mobile communication system includes: receiving, from a base station, first information associated with a resource allocation scheme for a first service and a second service; receiving, from the base station, control information associated with the first service; and receiving, from the base station, data for the first service on the basis of the control information and the first information.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/480,749, filed on Jul. 25, 2019, which is a national stageapplication of International Patent Application No. PCT/KR2018/003450,filed on Mar. 23, 2018, which designates the United States, which claimspriority to Korean Patent Application 10-2017-0037798, filed on Mar. 24,2017. The contents of each of these applications are incorporated hereinin their entirety.

TECHNICAL FIELD

An embodiment of the disclosure relates to a method for transmitting andreceiving information to provide a plurality of services via the sameresource in a communication system and an apparatus using the same. Moreparticularly, the disclosure relates to a method for transmitting andreceiving configuration information and feedback information to providea plurality of services via the same communication resource and anapparatus using the same.

BACKGROUND ART

In order to meet the demand for wireless data traffic, which has beenincreasing since the commercialization of a 4G communication system,efforts are being made to develop an improved 5G communication system orpre-5G communication system. For this reason, a 5G communication systemor pre-5G communication system is referred to as a beyond-4G-networkcommunication system or a post-LTE system. To achieve a high datatransmission rate, implementation of a 5G communication system in anextremely high frequency (mmWave) band (for example, a 60 GHz band) isbeing considered. To reduce the path loss of radio signals and toincrease the transmission distance of radio signals in an extremely highfrequency band, beamforming, massive multiple-input and multiple-output(massive MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analogbeamforming, and large-scale antenna techniques are under discussion fora 5G communication system. Further, to improve the system network,technical development in an evolved small cell, an advanced small cell,a cloud Radio Access Network (cloud RAN), an ultra-dense network,device-to-device (D2D) communication, wireless backhaul, a movingnetwork, cooperative communication, coordinated multi-points (CoMP), andreception interference cancellation is progressing for the 5Gcommunication system. In addition, an advanced coding modulation (ACM)scheme including hybrid FSK and QAM modulation (FQAM) and sliding windowsuperposition coding (SWSC), as well as advanced access techniquesincluding filter bank multi-carrier (FBMC), non-orthogonal multipleaccess (NOMA), and sparse code multiple access (SCMA) are beingdeveloped for the 5G system.

The Internet has evolved from a human-centered connection network, inwhich humans generate and consume information, into an Internet ofThings (IoT) network, in which distributed components, such as objects,exchange and process information. Internet-of-everything (IoE)technology, in which big-data processing technology is combined with theIoT through connection with a cloud server and the like, has alsoemerged. As technological elements, such as sensing technology,wired/wireless communication and network infrastructure, serviceinterface technology, and security technology are required to implementIoT, technologies for sensor networks, machine-to-machine (M2M)communication, and machine-type communication (MTC) have recently beenstudied with the goal of connecting objects. In an IoT environment, anintelligent Internet technology (IT) service that collects and analyzesdata generated from connected objects may be provided to generate newvalue in human lives. The IoT is applicable to the fields of a smarthome, a smart building, a smart city, a smart car or connected car, asmart grid, health care, a smart home appliance, advanced medical careservices, and the like through convergence and integration of existinginformation technology with various industries.

Accordingly, various attempts are being made to apply a 5G communicationsystem to the IoT network. For example, 5G communication technologies,such as a sensor network, M2M communication, and MTC, are implemented bybeamforming, MIMO, and array-antenna schemes. Applying a cloud radioaccess network (RAN) as the big-data processing technology describedabove is an example of the convergence of 5G technology and IoTtechnology.

In a communication system, a plurality of services may be provided to auser. To provide a plurality of services to a user, there is required amethod for providing individual services in the same time periodaccording to characteristics and for providing the plurality of servicesusing the same time and frequency resources and a device using the same.

SUMMARY

Therefore, embodiments of the disclosure have been made in view of theabove-mentioned problems, and an aspect of the disclosure is to providea method and an apparatus for simultaneously providing different typesof service. An embodiment of the disclosure is to provide a method oftransmitting and receiving configuration information in order to receivedifferent types of services within the same time interval by obtaininginformation received according to the characteristics of each servicewhen the different types of services are provided at the same time andof transmitting and receiving feedback information in response totransmission of data about each service, and an apparatus using thesame.

In view of the foregoing aspects, a communication method of a userequipment (UE) in a mobile communication system according to anembodiment of the disclosure includes: receiving first informationassociated with a resource allocation scheme for a first service and asecond service from a base station; receiving control informationassociated with the first service from the base station; and receivingdata about the first service from the base station on the basis of thecontrol information and the first information.

A communication method of a base station in a mobile communicationsystem according to another embodiment of the disclosure includes:transmitting first information associated with a resource allocationscheme for a first service and a second service to a UE; transmittingcontrol information associated with the first service to the UE; andtransmitting data about the first service to the UE on the basis of thecontrol information and the first information.

A UE in a mobile communication system according to still anotherembodiment of the disclosure includes: a transceiver configured totransmit and receive a signal; and a controller configured to beconnected with the transceiver, to receive first information associatedwith a resource allocation scheme for a first service and a secondservice from a base station, to receive control information associatedwith the first service from the base station, and to receive data aboutthe first service from the base station on the basis of the controlinformation and the first information.

A base station in a mobile communication system according to yet anotherembodiment of the disclosure includes: a transceiver configured totransmit and receive a signal; and a controller configured to beconnected with the transceiver, to transmit first information associatedwith a resource allocation scheme for a first service and a secondservice to a UE, to transmit control information associated with thefirst service to the UE, and to transmit data about the first service tothe UE on the basis of the control information and the firstinformation.

According to an embodiment of the disclosure, it is possible toefficiently provide a plurality of services using the same time andfrequency resources in a communication system, thereby enabling theefficient use of communication resources and improving the efficiencyand reliability of each service.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates time and frequency resources in a system to which anembodiment of the disclosure is applicable;

FIG. 2 illustrates a scenario between a UE receiving a plurality ofservices and a base station according to an embodiment of thedisclosure;

FIG. 3 illustrates a resource allocation method for providing aplurality of services in time and frequency resources according to anembodiment of the disclosure;

FIG. 4 illustrates a resource allocation method for a plurality ofservices according to an embodiment of the disclosure;

FIG. 5 illustrates a resource allocation method for a plurality ofservices according to another embodiment of the disclosure;

FIG. 6 illustrates a resource allocation method for a plurality ofservices according to still another embodiment of the disclosure;

FIG. 7 illustrates an information transmission method for supporting aplurality of services according to an embodiment of the disclosure;

FIG. 8 illustrates a feedback information transmission method forsupporting a plurality of services according to an embodiment of thedisclosure;

FIG. 9 illustrates the operation of a UE generating feedback informationfor supporting a plurality of services according to an embodiment of thedisclosure;

FIG. 10 illustrates a method of transmitting and receiving feedbackinformation for supporting a plurality of services according to anembodiment of the disclosure;

FIG. 11 illustrates a method of transmitting and receiving feedbackinformation for supporting a plurality of services according to anotherembodiment of the disclosure;

FIG. 12 illustrates a method of transmitting and receiving feedbackinformation for supporting a plurality of services according to stillanother embodiment of the disclosure;

FIG. 13 illustrates a method of transmitting and receiving feedbackinformation for supporting a plurality of services according to yetanother embodiment of the disclosure;

FIG. 14 illustrates a UE according to an embodiment of the disclosure;and

FIG. 15 illustrates a base station according to an embodiment of thedisclosure.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

Hereinafter, embodiments of the disclosure will be described in detailwith reference to the accompanying drawings.

In describing the exemplary embodiments of the disclosure, descriptionsrelated to technical contents which are well-known in the art to whichthe disclosure pertains, and are not directly associated with thedisclosure, will be omitted. Such an omission of unnecessarydescriptions is intended to prevent obscuring of the main idea of thedisclosure and more clearly transfer the main idea.

For the same reason, in the accompanying drawings, some elements may beexaggerated, omitted, or schematically illustrated. Further, the size ofeach element does not entirely reflect the actual size. In the drawings,identical or corresponding elements are provided with identicalreference numerals.

The advantages and features of the disclosure and ways to achieve themwill be apparent by making reference to embodiments as described belowin detail in conjunction with the accompanying drawings. However, thedisclosure is not limited to the embodiments set forth below, but may beimplemented in various different forms. The following embodiments areprovided only to completely disclose the disclosure and inform thoseskilled in the art of the scope of the disclosure, and the disclosure isdefined only by the scope of the appended claims. Throughout thespecification, the same or like reference numerals designate the same orlike elements.

Here, it will be understood that each block of the flowchartillustrations, and combinations of blocks in the flowchartillustrations, can be implemented by computer program instructions.These computer program instructions can be provided to a processor of ageneral purpose computer, special purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the processor of the computer orother programmable data processing apparatus, create means forimplementing the functions specified in the flowchart block or blocks.These computer program instructions may also be stored in a computerusable or computer-readable memory that can direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer usable orcomputer-readable memory produce an article of manufacture includinginstruction means that implement the function specified in the flowchartblock or blocks. The computer program instructions may also be loadedonto a computer or other programmable data processing apparatus to causea series of operational steps to be performed on the computer or otherprogrammable apparatus to produce a computer implemented process suchthat the instructions that execute on the computer or other programmableapparatus provide steps for implementing the functions specified in theflowchart block or blocks.

And each block of the flowchart illustrations may represent a module,segment, or portion of code, which includes one or more executableinstructions for implementing the specified logical function(s). Itshould also be noted that in some alternative implementations, thefunctions noted in the blocks may occur out of the order. For example,two blocks shown in succession may in fact be executed substantiallyconcurrently or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved.

As used herein, the “unit” refers to a software element or a hardwareelement, such as a Field Programmable Gate Array (FPGA) or anApplication Specific Integrated Circuit (ASIC), which performs apredetermined function. However, the “unit does not always have ameaning limited to software or hardware. The “unit” may be constructedeither to be stored in an addressable storage medium or to execute oneor more processors. Therefore, the “unit” includes, for example,software elements, object-oriented software elements, class elements ortask elements, processes, functions, properties, procedures,sub-routines, segments of a program code, drivers, firmware,micro-codes, circuits, data, database, data structures, tables, arrays,and parameters. The elements and functions provided by the “unit” may beeither combined into a smaller number of elements, “unit” or dividedinto a larger number of elements, “unit”. Moreover, the elements and“units” may be implemented to reproduce one or more CPUs within a deviceor a security multimedia card.

FIG. 1 illustrates time and frequency resources in a system to which anembodiment of the disclosure is applicable.

Referring to FIG. 1 , the horizontal axis represents the time domain andthe vertical axis represents the frequency domain. The minimumtransmission unit in the time domain is an OFDM symbol. N_(symb) OFDMsymbols 102 may form one slot 106, and a plurality of slots 106 may beincluded in 1 ms.

A basic unit of a resource in the time-frequency domain is a resourceelement (RE) 112, which may be represented by an OFDM symbol index and asubcarrier index. A resource block (RB) or a physical resource block(PRB) 108 may be defined by N_(symb) consecutive OFDM symbols 102 in thetime domain and N_(RB) consecutive subcarriers 110 in the frequencydomain. Thus, one RB 108 in one slot may include N_(symb)×N_(RB) REs112. Generally, a minimum frequency-domain allocation unit for data isan RB. In the LTE system, N_(symb)=7 and N_(RB)=12 in general, andN_(BW) and N_(RB) may be proportional to the system transmissionbandwidth. A data rate may increase in proportion to the number of RBsscheduled for a UE.

In an FDD system which operates a downlink and an uplink separately indifferent frequencies, the downlink transmission bandwidth and theuplink transmission bandwidth may be different from each other.According to one embodiment, in a time interval, some RBs may be usedfor an uplink, and some RBs may be used for a downlink.

A channel bandwidth represents an RF bandwidth corresponding to a systemtransmission bandwidth. Table 1 illustrates the relationship betweensystem transmission bandwidth and channel bandwidth defined in the LTEsystem. For example, an LTE system with a 10 MHz channel bandwidth canhave a transmission bandwidth of 50 RBs. Further, various numerologiesmay be configured in combination within one system. The embodiment towhich the disclosure is applicable is not limited to the followingtable.

TABLE 1 Channel bandwidth BW_(Channel) [MHz] 1.4 3 5 10 15 20Transmission bandwidth configuration N_(RB) 6 15 25 50 75 100

Downlink control information may be transmitted within first N OFDMsymbols in a subframe. In one embodiment, N={1, 2, 3} in general.Therefore, N may be variably applied in each subframe according to theamount of control information to be transmitted in the current subframe.The transmitted control information may include a control channeltransmission interval indicator indicating the number of OFDM symbolsthrough which the control information is transmitted, schedulinginformation about downlink data or uplink data, and HARQ ACK/NACKinformation.

In the LTE system, scheduling information about downlink data or uplinkdata is transmitted from a base station to a UE through downlink controlinformation (DCI). DCI is defined according to various formats, and itis indicated according to each format whether DCI includes schedulinginformation (uplink (UL) grant) about uplink data or schedulinginformation (downlink (DL) grant) about downlink data, whether DCI iscompact DCI having small-size control information, whether to applyspatial multiplexing using multiple antennas, and whether DCI is usedfor power control. For example, DCI format 1, which is schedulingcontrol information (DL grant) about downlink data, may include at leastone of the following pieces of control information.

-   -   Resource allocation type 0/1 flag: may indicate whether a        resource allocation method is type 0 or type 1. Type 0 may        allocate resources in resource block groups (RBGs) by applying a        bitmap. In a communication system, for example, in an LTE        system, a basic unit for scheduling may be an RB represented by        time-frequency domain resources, and an RBG may include a        plurality of RBs, and may be a basic unit for scheduling in        type 0. Type 1 may allocate a specific RB in an RBG.    -   Resource block assignment: may indicate an RB allocated for data        transmission. A represented resource may be determined according        to the system bandwidth and the resource allocation method.    -   Modulation and coding scheme (MCS): may indicate a modulation        scheme used for data transmission and the size of a transport        block (TB) as data to be transmitted.    -   HARQ process number: may indicate an HARQ process number.    -   New data indicator: may indicate whether HARQ is initial        transmission or retransmission.    -   Redundancy version: may indicate the redundancy version of HARQ.    -   Transmit power control (TPC) command for physical uplink control        channel (PUCCH): may indicate a transmission power control        command for a PUCCH as an uplink control channel.

The DCI may be transmitted on a physical downlink control channel(PDCCH) (interchangeable with control information) or an Enhanced PDCCH(interchangeable with enhanced control information), which is a physicaldownlink control channel, via channel coding and modulation.

In general, the DCI may be scrambled with a specific radio networktemporary identifier (RNTI or a UE identifier) independently for each UEto be added with a cyclic redundancy check (CRC), may be channel-coded,and may be configured as an independent PDCCH to be transmitted. In thetime domain, the PDCCH may be mapped and transmitted during the controlchannel transmission interval. The frequency-domain mapping position ofthe PDCCH may be determined by the identifier (ID) of each UE, and maybe transmitted throughout the entire system transmission band. In oneembodiment, at least one UE may form a group, and the same identifiermay be allocated for the group, thereby transmitting a control signal tothe group of the UE having obtained the identifier. This information mayalso be transmitted through at least one of a PDCCH or an EPDCCH.

Downlink data may be transmitted on a physical downlink shared channel(PDSCH), which is a physical channel for transmitting downlink data. ThePDSCH may be transmitted after the control channel transmissioninterval, and scheduling information, such as a specific mappingposition in the frequency domain and a modulation scheme, may bedetermined on the basis of the DCI transmitted through the PDCCH.

Through the MCS among the control information included in the DCI, abase station may notify a UE of the modulation scheme applied to thePDSCH to be transmitted and the transport block size (TBS) of the datato be transmitted. In one embodiment, the MCS may include five bits, ormore or fewer than five bits. The TBS may correspond to the size of data(transport block: TB) to be transmitted by the base station to whichchannel coding for error correction is not yet applied.

Modulation schemes supported by the LTE system include quadrature phaseshift keying (QPSK), 16-quadrature amplitude modulation (16QAM), and64QAM, modulation orders (Q_(m)) of which may be 2, 4, and 6,respectively. That is, two bits per symbol may be transmitted in QPSK,four bits per symbol may be transmitted in 16QAM, and six bits persymbol may be transmitted in 64QAM. Further, 256QAM or higher modulationschemes may be used depending on system modifications.

A mobile communication system may provide a plurality of services. Theplurality of services may include at least one of an enhanced mobilebroadband (eMBB) service, an ultra-reliable and low-latencycommunications (URLLC) service, and a massive machine-typecommunications (mMTC) service. An existing LTE system receives only ascheduling resource for a base station, regardless of the service of auser device, and there is no division of a frame structure in a resourceregion. Therefore, in order to provide the plurality of services usingthe same resource, it may be necessary to divide a resource region, andthere is a need to transmit and receive relevant information.Hereinafter, an eMBB service is referred to as a first-type service, andeMBB data is referred to as first-type data. The first-type service orthe first-type data is not limited to eMBB but may be applicable to thecase where high-speed data transmission is required or broadbandtransmission is performed. A URLLC service is referred to as asecond-type service, and URLLC data is referred to as second-type data.The second-type service or the second-type data is not limited to URLLCbut may be applicable to other systems where low latency is required orhigh-reliability transmission is required or where low latency and highreliability are required at the same time. An mMTC service is referredto as a third-type service, and mMTC data is referred to as third-typedata. The third-type service or the third-type data is not limited tomMTC but may be applicable to the case where low speed, wide coverage,or low power is required. In describing an embodiment, the first-typeservice may be construed as including or not including the third-typeservice.

Further, with the improvement in communication systems, it is necessaryto streamline feedback transmission and reception according to datatransmission. In a conventional LTE system, data transmission isperformed in transport block (TB) units. A TB may be divided into aplurality of code blocks (CBs), and channel coding may be performed inCB units. When retransmission is performed after initial transmission,retransmission is performed in TB units. In this case, even though onlyone CB fails to decode, an entire TB may be retransmitted. In order toimprove transmission and reception performance, CB-based feedbacktransmission and retransmission may be required.

FIG. 2 illustrates a scenario between a UE receiving a plurality ofservices and a base station according to an embodiment of thedisclosure.

Referring to FIG. 2 , a base station 210 may provide a plurality ofservices for UEs 212 and 214. The embodiment shows the case where eMBBand URLLC services are provided, but the disclosure is not limitedthereto. Also, each service may be provided to a separate UE, as in aneMBB UE 212 and a URLLC UE 214, but a plurality of services may besimultaneously provided to the same UE.

In scenario 1, the base station 210 performs downlink transmission toeach of the UEs 212 and 214. In this case, since resources for the URLLCUE 214 may be preferentially allocated, the eMBB UE 212 may not receivedata in a corresponding resource region.

In scenario 2, each of the UEs 212 and 214 performs uplink transmissionto the base station 210. In this case, since resources for the URLLC UE214 may also be preferentially allocated, the eMBB UE 212 may nottransmit data in a corresponding resource region.

In scenario 3, the base station 210 receives an uplink signal from theeMBB UE 212 and transmits a downlink signal to the URLLC UE 214. In thiscase, the downlink signal transmitted from the base station 210 to theURLLC UE 214 may cause interference in the eMBB UE 212, and the uplinksignal transmitted from the eMBB UE 212 may cause interference in theURLLC UE 214.

In scenario 4, the base station 210 transmits a downlink signal to theeMBB UE 212 and receives an uplink signal from the URLLC UE 214. In thiscase, the downlink signal transmitted from the base station 210 to theeMBB UE 212 may cause interference in the URLLC UE 214, and the uplinksignal transmitted by the URLLC UE 214 may cause interference in theeMBB UE 212.

There is a need for a method for providing a plurality of services viathe same resource. In a communication system, a base station maystatically, semi-statically, or dynamically allocate each resource inorder to provide eMBB, URLLC, and mMTC services. Such scheduling mayoperate separately in a time domain or in a frequency domain. Further,resource regions for providing individual services may be mixed, andthus a method of providing services is described as follows. Embodimentsare not limited to a description of providing eMBB and URLLC services,and the following description may similarly be applied to resourceallocation for providing an mMTC service. In one embodiment, individualservices may perform communication in bandwidths at least some of whichoverlap.

FIG. 3 illustrates a resource allocation method for providing aplurality of services in time and frequency resources according to anembodiment of the disclosure.

FIG. 3 shows one slot. One slot may include 14 symbols. In oneembodiment, one slot may include 7 symbols.

According to one embodiment, symbol 0 310 may be allocated for downlinkcontrol channel transmission, symbols 1 to 4 320 may be allocated fordownlink data transmission, symbol 5 340 may be used as a guide symbolfor a switch to downlink uplink transmission, and symbol 6 350 may beallocated for uplink control channel transmission. In one embodiment,the downlink data transmission may include resources for UE 2 performingeMBB.

Here, a resource region 330 for providing a URLLC service may beallocated in symbols 1 to 4 320. This region may include a resource 332for control channel transmission and a resource 334 for data channeltransmission. Alternatively, the resource 332 for control channeltransmission may be included in some of resources for a downlink controlchannel. The resource region 330 for providing the URLLC service may bedynamically allocated depending on whether a URLLC service is required.Specifically, when a resource is dynamically allocated for a URLLCservice in eMBB resources, each resource may be allocated in a separateregion, or may be allocated via multiplexing. More specifically, when aresource for providing a plurality of services is allocated viamultiplexing in the same resources, the resource may be allocated by atleast one of puncturing, preemption, and superposition. Here, the eMBBUE cannot receive data in a resource region punctured to provide a URLLCservice. Here, if there is a large quantity of resources (TB(s), CB(s),or PRB(s)), the eMBB UE may fail in decoding. As a result, the eMBB UEneeds to request retransmission from a base station and further needs tocontinuously provide resources associated with a buffer for performingan HARQ, which may reduce efficiency of resource utilization. Accordingto one embodiment, in puncturing, information for URLLC may betransmitted in a region where data for eMBB transmission is transmitted,and information for an eMBB service may not be transmitted beforepuncturing. In preemption, data for providing an eMBB service may not beallocated in a region for transmitting information for URLLC, and thedata for providing the eMBB service may be transmitted in the otherresource region. In superposition, data for providing an eMBB serviceand information for URLLC transmission may be transmitted viamultiplexing in a region for URLLC transmission.

In order to provide a plurality of services in the same resource region,it is necessary to determine a resource allocation method and toexchange information thereabout.

FIG. 4 illustrates a resource allocation method for a plurality ofservices according to an embodiment of the disclosure.

Referring to FIG. 4 , frequency resources may include a first region 410for providing an eMBB service and a second region 420 in which resourcesfor an eMBB and URLLC may coexist. Specifically, resource allocation foran eMBB service may be performed in the first region 410, and the secondregion 420 may include a third region 422 for providing an eMBB serviceand a fourth region 424 in which resource allocation for a URLLC servicemay be performed. According to one embodiment, resource allocation foran eMBB service may be generally performed in the fourth region 424, andresources may be dynamically allocated in the region if it is requiredto provide a URLLC service.

However, the resource allocation type for providing a plurality ofservices is not limited to what is shown in the drawing. The secondregion 420 may be allocated in all frequency resources, or the secondregion 420 may be allocated only in part of a time region.

A base station may notify a UE that such regions exist by transmittingconfiguration information. The configuration information may allocate atleast one of information indicating whether each region exists andinformation indicating a bandwidth if the region exists, and the basestation may also transmit information indicating whether a resource forURLLC transmission is allocated in the fourth region to the UE. However,this information is not necessarily transmitted, and may be implicitlyconfigured between the UE and the base station according to anembodiment. Specifically, the UE can also obtain information about thesize of a URLLC resource region. Thus, the UE can obtain informationabout whether a resource for URLLC is allocated and information about anallocated resource region.

FIG. 5 illustrates a resource allocation method for a plurality ofservices according to another embodiment of the disclosure.

Referring to FIG. 5 , one slot may include a total of seven symbols. Thenumber of symbols may vary depending on the embodiment. In theembodiment, when a resource for URLLC is dynamically allocated, theresource for URLLC may be allocated by puncturing, preemption, orsuperposition in a part of a resource region for eMBB communication. Inthis case, numerology for an eMBB service and numerology for URLLC maybe the same. Although the drawing shows that one entire symbol forms oneslot for URLLC transmission in a TDM form, various combinations mayexist. Also, in the embodiment, each subcarrier spacing is 30 kHz, andone slot includes seven symbols and 0.25 ms, which may vary depending onthe embodiment.

Specifically, a first symbol 0 510 in the slot may be allocated for adownlink control channel for eMBB, and symbol 1-2 520 may be allocatedfor a resource for URLLC. More specifically, symbol 1 522 may beallocated for a control channel for URLLC, and symbol 2 524 may beallocated for a data channel for URLLC. Symbol 3-4 530 may be allocatedfor a downlink data channel for eMBB, symbol 5 540 may be allocated fora GP, and symbol 6 550 may be allocated for uplink control channeltransmission.

In the embodiment, a resource region for URLLC may also be allocated ina region other than that indicated in the drawings on a time axis.Specifically, the resource region for URLLC may be allocated in any oneof symbols 1 to 4 included in a data region for eMBB.

As described above, to provide services using URLLC and eMBB, at leastone symbol, among symbols allocated for eMBB service transmission, maybe allocated for a URLLC service. Further, in the embodiment, when a UEobtains information indicating that URLLC is allocated, the UE maydetermine that transmission for eMBB is not performed in a resourceregion for URLLC.

The embodiment has been described as including seven symbols, but is notlimited thereto. Resources may be similarly configured in a structureincluding 14 symbols or more, and the quantity of resources for acorresponding channel may also be increased or reduced.

FIG. 6 illustrates a resource allocation method for a plurality ofservices according to still another embodiment of the disclosure.

Referring to FIG. 6 , one slot may include a total of seven symbols. Thenumber of symbols may vary depending on the embodiment. In theembodiment, when a resource for URLLC is dynamically allocated, theresource for URLLC may be allocated by puncturing, preemption, orsuperposition in a part of a resource region for eMBB communication. Inthis case, numerology for an eMBB service and numerology for URLLC maybe different. The drawing shows that a portion of one symbol forms amini-slot for URLLC transmission in a TDM form, and the resource mayinclude a plurality of PRBs in the embodiment. In addition, variouscombinations may exist. Also, in the embodiment, subcarrier spacing foreMBB is 30 kHz, subcarrier spacing for URLLC is 60 kHz, and one slotincludes seven symbols and 0.25 ms, which may vary depending on theembodiment.

Specifically, symbol 0 610 may be allocated for a downlink controlchannel for eMBB. In the embodiment, the downlink control channelallocated to symbol 0 610 may be disposed in a portion of a resourceregion on a frequency, and the remaining portion of the resource regionmay be allocated for a downlink data channel, may be allocated for aresource for different communication, or may not be allocated for aresource. A resource for URLLC may be allocated in a portion 620 ofsymbol 3. More specifically, mini-symbol 1 622 may be allocated for acontrol channel for URLLC, and mini-symbol 2 624 may be allocated for adata channel for URLLC. Symbol 1-5 630 excluding the portion 620 may beallocated for a downlink data channel for eMBB, symbol 5 640 may beallocated for a GP, and symbol 6 650 may be allocated for uplink controlchannel transmission. In the embodiment, the portion 620 for a URLLCservice may be disposed in a different position in the frequency domainor the time domain. More specifically, the portion 620 may bedynamically allocated to any position in a data region 630 for eMBB.

As described above, to provide services using URLLC and eMBB, at leastone symbol among symbols allocated for eMBB service transmission may beallocated for a URLLC service.

In the embodiment, a resource region for URLLC may be dynamicallyallocated in a resource region allocated for eMBB. Specifically, when itis necessary to transmit information for providing a URLLC service, abase station may allocate a resource region for providing a URLLCservice in a portion of a resource region allocated for eMBB. Whenperforming such transmission, a UE receiving an eMBB service cannotreceive information for receiving the eMBB service in the correspondingresource region due to the transmission of the information for providingthe URLLC service. In this case, the base station may notify the UE thata resource for URLLC transmission is allocated in the resource regionfor eMBB through an indication. Specifically, the base station maynotify the eMBB UE of information about puncturing, preemption, orsuperposition of a resource for providing a URLLC service in aparticular resource region and of the type thereof, and the signal maybe transmitted via a higher-layer signal including a control channelsignal or an RRC signal. The eMBB UE may be notified that the resourcefor URLLC transmission is allocated before transmitting the informationfor providing the URLLC service, in the same slot, or in a next slot. Inthe following embodiments, such information is not limited to adescription based on puncturing. Further, the eMBB UE may perform anoperation, such as not performing decoding or waiting forretransmission, for eMBB data reception in a corresponding region wherepuncturing is performed through the indication, which will be describedwith reference to a specific embodiment.

FIG. 7 illustrates an information transmission method for supporting aplurality of services according to an embodiment of the disclosure.

Referring to FIG. 7 , resources for providing an eMBB service and aURLLC service may be allocated in consecutive slot n 710 and slot n+1730.

A downlink control channel for providing an eMBB service may betransmitted via symbol 0 712 and 732 in each slot, and a downlink datachannel for providing an eMBB service may be transmitted via symbols 1to 4 716 and 734. Also, a gap may be allocated to symbol 5 718 and 738,and an uplink control channel may be allocated to symbol 6 720 and 740.

Further, a resource region 714 for transmitting information forproviding a URLLC service may be allocated in symbols 1 to 4 716 of slotn 710. In the embodiment, a base station may notify a UE whether aresource region is allocated through an indication. In the embodiment,the indication may be transmitted to the UE via a control channel.Specifically, as indicated by reference numeral 740, it is possible totransmit information about whether a resource is allocated and about theresource allocation type through a control channel before resourceallocation. Also, as indicated by reference numeral 750, it is possibleto transmit information about whether a resource is allocated and aboutthe resource allocation type through a data channel of the same slot.Further, as indicated by reference numeral 760, it is possible totransmit information about whether a resource is allocated and about theresource allocation type through a control channel of the next slot. Aspecific operating method is illustrated as follows.

As indicated by reference numeral 750, transmission of the indicationbefore URLLC resource allocation may be referred to as pre-indication.The base station may transmit at least one of whether overlappingapplies to a resource, whether puncturing applies to a resource, whetherpreemption applies to a resource, and whether superposition applies to aresource and information about an allocated resource to an eMBB UE. Inthe embodiment, the information may be transmitted via a signal using acontrol channel (new RAT PDCCH). In one embodiment, a channel for thesignal may transmit the information through a downlink control channeldisposed first in a corresponding slot (or subframe) so as to have afeature of pre-indication. In another embodiment, the indication signalmay be particular RBs in a resource region allocated for the eMBB UE,more specifically a portion of an initial data or last data resourceregion configured in a resource region allocated for data transmission.In addition, depending on the embodiment, the information may betransmitted through a separate resource region to whichfrequency-division multiplexing applies.

As indicated by reference numeral 760, transmission of the informationin a data region of the same slot may be referred to as on-transmission.The base station may transmit at least one of whether overlappingapplies to a resource, whether puncturing applies to a resource, whetherpreemption applies to a resource, and whether superposition applies to aresource and information about an allocated resource to the eMBB UEthrough a portion of a resource region allocated for downlink datatransmission to the eMBB UE. Specifically, the channel for the signalmay transmit the information through some of data RB(s) allocated forthe eMBB UE during transmission. In another embodiment, the informationmay be transmitted through a preset region of a resource regionallocated for downlink data transmission in a corresponding slot (orsubframe).

As indicated by reference numeral 770, transmission of the informationin a data region of a slot following the slot in which a resource forURLLC is allocated may be referred to as post-indication. The basestation may transmit at least one of whether overlapping applies to aresource, whether puncturing applies to a resource, whether preemptionapplies to a resource, and whether superposition applies to a resourceand information about an allocated resource to the eMBB UE through acontrol channel of a subsequent slot. Specifically, the indication maybe transmitted using a downlink control channel. In one embodiment, someresources (common search space or UE search space) of a PDCCH may beincluded. Further, in one embodiment, the information may be transmittedin a slot associated with retransmission of corresponding data afterACK/NACK feedback from the UE in response to the transmission by a gNB.Here, the information may be transmitted on a control channel (PDCCH) ofthe retransmission slot. This information may be commonly transmitted toeMBB UEs in a cell. Specifically, the UEs in the cell may receive theinformation including the indication on the basis of a group identifierallocated to eMBB UEs.

The information may also include an HARQ ID, indication information, anNDI, an RV, or the like in a UE-specific DCI format. Specifically, themethod for indicating the information may vary depending on the numberof bits of information.

1) One bit: This information may indicate whether puncturing isperformed due to URLLC in the previous transmission of a correspondingHARQ.

2) Two bits or more: This information may indicate whether puncturing isperformed due to URLLC in a previous transmission of a correspondingHARQ and a CB(s) in which puncturing is performed.

Further, when indication information of two bits or more is used, it ispossible to indicate at least one CB in which puncturing is performed,and it is also possible to indicate a set of such CBs to a UE.

In another embodiment, the signal may be transmitted before ACK/NACKfeedback from the UE in response to the transmission by the gNB. Thatis, the signal may be transmitted in a slot (N+1th) immediately after aslot (Nth) in which data transmission of eMBB, punctured due to URLLC,is performed or in a subsequent slot. If the signal is transmitted inthe subsequent slot, information indicating transmission in thesubsequent slot may also be transmitted. Specifically, it may beindicated whether puncturing is performed in the previous slot due toURLLC using a common DCI format. More specifically, the method forindicating the information may vary depending on the number of bits ofinformation. Further, this information may be transmitted to aparticular UE or may be commonly transmitted to a group of UEs.

1) One bit: This information may indicate whether puncturing isperformed due to URLLC in a previous transmission (N−1th slot) of acorresponding HARQ (Nth slot).

2) Two bits: This information may indicate whether puncturing isperformed due to URLLC in previous transmissions (N−1th, N−2th, N−3th,and N−4th slots) of a corresponding HARQ (Nth slot).

It is possible to indicate a CB(s) in which puncturing is performedaccording to the number of bits indicated, and a mapping relationshipmay be transmitted via preset information or separate signaling.

Further, according to the embodiment, it is possible to indicate an HARQID, indication information, an NDI, an RV, or the like in a UE-specificDCI format.

1) One bit: This information may indicate whether puncturing isperformed due to URLLC in a previous transmission of a correspondingHARQ.

2) Two bits: This information may indicate a CB(s) in which puncturingis performed due to URLLC in a previous transmission of a correspondingHARQ.

According to the embodiment, in order to effectively provide differenttypes of services, it is necessary to simplify a retransmissionprocedure in response to decoding failure. Specifically, it is possibleto reduce a delay in transmission time or to efficiently utilize atleast one of frequency-time and spatial resources, and it is necessaryto reduce the usage of an HARQ buffer memory of a UE using additionalbase station signaling before transmitting an HARQ ACK/NACK message.

FIG. 8 illustrates a feedback information transmission method forsupporting a plurality of services according to an embodiment of thedisclosure.

Referring to FIG. 8 , a base station may transmit data to a UE and mayreceive HARQ feedback information in response.

In operation 805, the base station may transmit configurationinformation for an HARQ to the UE. This operation may be optionallyperformed and may not be essential. The configuration information forthe HARQ may include information indicating the method of performingfeedback on transmitted data. Specifically, the base station mayconfigure information about whether to perform TB-based feedback orCB-based feedback on data transmitted to the UE. The configurationinformation may also be obtained by exchanging bit information allocatedfor HARQ feedback.

In operation 810, the UE may receive data from the base station. Thedata may include at least one TB, and the TB may include at least oneCB.

In operation 815, the UE may decode the received TB. Specifically, theUE may decode the at least one CB included in the TB and may thus decodeall CBs included in the TB. If necessary, the UE may decode only the TB.This configuration may be determined through explicit signaling betweenthe base station and the UE, or may also be implicitly determined.

In operation 820, the UE may determine whether the entire TB issuccessfully decoded. Specifically, the UE may determine whether all theCBs included in the TB are successfully decoded. If decoding issuccessful, the UE may transmit an ACK feedback to the base station inoperation 825.

In operation 830 for all the CBs, the UE may determine whether feedbackon a plurality of CBs is requested from the base station. The requestfor the feedback on the plurality of CBs may be transmitted viahigher-layer signaling or physical-layer signaling. Here, if thefeedback on the plurality of CBs is not requested, the UE may transmitNACK feedback in operation 835. Specifically, even though one bit isallocated for the HARQ in the configuration information for the HARQ, ifdecoding of at least one CB fails, the UE may transmit NACK feedback.

If feedback on the plurality of CBs is requested from the base station,the UE may transmit information about success or failure in decodingeach CB to the base station. Specifically, the UE may transmitinformation about a CB successfully decoded or a CB decoding of whichfailed to the base station, and the base station may performretransmission on the basis of the information.

According to the embodiment, one TB may include a plurality of CBs, andeach CB may include CRC bits. If one CB fails, the entire TB fails to bedecoded, and thus the UE may transmit an HARQ NACK.

Further, as described above, HARQ ACK/NACK feedback may be performed onthe basis of one CB or a plurality of CBs. Specifically, one TB mayinclude a plurality of CBs, and each CB may include CRC bits. Here, asdescribed above, an HARQ NACK may be configured using a plurality ofbits, and information about a CB(s) that has failed to be decoded or hasbeen successfully decoded may be transmitted to the base station. In oneembodiment, if the number of bits for an HARQ NACK is 2, 2{circumflexover ( )}2 types of HARQ NACKs may be indicated. For example, if oneslot includes seven symbols, symbol 0 as a first symbol is configuredfor downlink control, symbol 6 is configured for uplink control, andsymbol 5 is configured for a gap, symbols 1, 2, 3, and 4 may beallocated for a downlink data region. In this case, if at least one ofCB1 and CB2 fails, 01 may be transmitted; if at least one of CB3 and CB4fails, 10 may be transmitted. 00 may indicate the failure of all CBs,and 11 may indicate the success of all CBs. In this embodiment using twobits, the mapping sequence and relationship of a CB(s) to the bits maybe similar or extended. According to one embodiment, information of twobits or more may be allocated to transmit feedback information about aCB. In addition, according to one embodiment, it is possible to indicateACK/NACK of information corresponding to a mapped physical resource.Specifically, the UE may transmit ACK/NACK of all CBs transmitted in aparticular resource region to the base station. According to anotherembodiment, it is possible to transmit only a number corresponding to afailed CB using an NACK message. As such, HARQ feedback on datatransmission may be performed in CB units, thereby efficiently utilizingresources.

When a resource is allocated, a UE receiving an eMBB service may performdifferent operations depending on the resource allocation method for aURLLC service and whether a resource is allocated. Specifically, withthe resource allocated, the UE receiving the eMBB service may receiveinformation about whether puncturing, preemption, or superpositionapplies to the resource through a control channel signal or a radioresource control (RRC) control signal of a base station. Here, thecontrol channel signal may be downlink control information present firstin a corresponding slot (or subframe). The RRC signal may be transmittedsemi-statically or statically to the UE through a data channel. Here, asshown in FIG. 5 or 6 , if the UE is allocated an overlapping resource,the UE needs to be able to perform decoding excluding a puncturedresource. In this case, success or failure in decoding may be determinedon the basis of the quantity of punctured resources. That is, if thereare a small number of resources punctured due to URLLC, it is possibleto recover eMBB data using an error recovery scheme. The error recoveryscheme may include a CRC checkup. When relevant information istransmitted as indicated by 760 and 770 of FIG. 7 , a control channeltransmitted by the base station may be transmitted to the UE before anACK/NACK transmitted from the UE to the base station is transmitted.This situation may proceed, for example, when there are a great numberof PRB(s) of punctured or preempted resources among resources allocatedto the eMBB UE in a previous slot and the gNB determines that failureobviously occurs.

In another embodiment, when an ACK/NACK is considered after explicitsignaling of zero (for a UE supporting a self-contained structure), one,or two slots, as in a new RAT system, it is necessary to reduce HARQ IDsand memories, rather than using a large number of HARQ IDs and memories,in view of management of HARQ process IDs. In this assumption, the basestation may autonomously determine efforts to reduce HARQ processes andmay perform retransmission as quickly as possible, thus expecting animprovement in HARQ process operation and throughput.

Here, UE types may be basically classified as follows.

1) UE Supporting Non-Self-Contained Structure

The base station may transmit HARQ ACK/NACK transmission timing (slotnumber or time) for the UE via DCI through a PDCCH.

2) UE Supporting Self-Contained Structure

Basically, this UE refers to a UE capable of processing data in acorresponding slot and transmitting an HARQ ACK/NACK via correspondinguplink control or data.

Hereinafter, a feedback transmission method will be described withreference to embodiments.

FIG. 9 illustrates the operation of a UE generating feedback informationfor supporting a plurality of services according to an embodiment of thedisclosure.

Referring to FIG. 9 , a UE may transmit and receive a signal to and froma base station. Specifically, in the embodiment, the UE is a UE forreceiving an eMBB service, and the base station may provide an eMBBservice and a URLLC service.

In operation 905, the UE may receive data about an eMBB service andidentification information about resource allocation for a URLLC servicefrom the base station. In the embodiment, the identification informationmay be received on the basis of at least one of pre-indication,on-duration, and post-indication, described above. In the embodiment,the identification information may include at least one of whether aresource is allocated for providing a URLLC service and the resourceallocation type.

In operation 910, the UE may buffer a TB for data reception on the basisof the received information. The TB may include at least one CB. In theembodiment, at least one CB may be referred to as a CB group, and it maybe possible to determine whether transmission is successful and toperform an HARQ on the basis of the CB group.

In operation 915, the UE may decode the buffered TB on the basis of thereceived information. As mentioned in the previous embodiment, decodingmay be performed on the basis of CB. If there is a high possibility offailure in decoding based on at least one piece of the informationreceived in operation 905, the UE may not perform decoding.Specifically, when a large proportion of resources is punctured forproviding a URLLC service, decoding is highly likely to fail, and thusthe UE may wait rather than perform decoding. Alternatively, the UE maynot autonomously store, but may discard the buffered TB or some CBs.

In operation 920, the UE may receive control information for schedulingthe data and data relevant thereto from the base station. Specifically,the data for providing the eMBB service, which may be transmitted in aresource region punctured for providing a URLLC service, may beretransmitted, and the control information for scheduling the data mayinclude at least one of information about whether merging decoding isperformed on the received retransmitted data, information about ACK/NACKtiming, an HARQ ID, and PUCCH resource information for ACK/NACKtransmission.

In operation 925, the UE may determine whether to flush buffered data onthe basis of the received information. Further, the UE may determinewhether to transmit an HARQ ACK/NACK and a transmission method. Also,the UE may determine whether to merge the received retransmitted data.

FIG. 10 illustrates a method of transmitting and receiving feedbackinformation for supporting a plurality of services according to anembodiment of the disclosure.

Referring to FIG. 10 , a base station may transmit downlink datascheduling information and ACK/NACK timing information related theretothrough a downlink control channel of a first slot. In the embodiment,an ACK/NACK timing may be an uplink control channel 1054 after twoslots.

In addition, a resource for a URLLC service may be allocated in symbols2 and 3 1016 of the first slot. Information about this resourceallocation may be transmitted to a UE by at least one of pre-indication,on-duration, and post-indication illustrated in the above embodiments.For example, the information may be transmitted at a timing indicated byreference numeral 1020 according to on-duration, while the informationmay be transmitted to the UE at a timing indicated by reference numeral1040 according to post-indication.

In this case, a UE receiving an eMBB service cannot receive data viasymbols 2 and 3 1016 and may determine whether to perform decoding onthe basis of data received through symbol 4 1018. According to theembodiment, the UE may transmit an ACK/NACK in CB units and may wait forretransmission.

The UE receiving identification information through reference numeral1020 or 1040 may perform at least one of retransmission reception andfeedback transmission on the basis of the identification information.

The UE may receive data, which the UE has failed to receive due topuncturing in the previous operation, through symbols 2 and 3 1036 of asecond slot, and may perform decoding on the basis of the data.Subsequently, the UE may transmit an ACK/NACK 1056 according to thedecoding result at the timing of the ACK/NACK 1056 through an uplinkcontrol channel of symbol 6 1054 of a third slot.

In the embodiment, when the UE is scheduled to transmit an explicit HARQsignal in an n+2th slot, the base station and the UE may operate asfollows.

First, when a certain number of CBs or RBs are punctured, the basestation may perform corresponding retransmission immediately at the timewhen reallocation is possible (the next slot in the embodiment) ratherthan waiting for the HARQ timing of the UE. Here, the foregoingindication may be used to indicate whether puncturing applies. Datapackets immediately retransmitted may overlap an ACK/NACK transmissiontiming scheduled in a previous transmission. In one embodiment, the slotmay be included in an uplink resource for supporting like coverage.

Here, the foregoing indication may be used to indicate whetherpuncturing applies, and an HARQ ID and a PUCCH resource according to theoperation of the base station may be configured as follows.

1. The base station may perform data transmission to the UE in a firstslot by allocating HARQ ID #0 and allocation HARQ PUCCH resource #0 andmay perform data transmission in a second slot including retransmissionby repeatedly allocating HARQ ID #0 and allocation HARQ PUCCH resource#0. In this case, once only an NDI is toggled without any indication,the UE may flush a buffer associated with data received in the firstslot and may perform decoding in response to the retransmission.Further, the foregoing indication may transmit the HARQ ID and the PUCCHresource. The indication may be common DCI or UE-specific DCI.

2. The base station may perform first transmission to the UE using HARQID #0 and allocation HARQ PUCCH resource #0 and may perform secondtransmission including retransmission by differently allocating HARQ ID#0 and allocation HARQ PUCCH resource #1. In this case, the UE maytransmit the decoding result in response to the retransmission throughPUCCH resource #1 and may transmit a feedback result through a resourceselected from among #0 or #1 on the basis of the decoding result.

According to the UE operation, the UE may identify failure of receptionin symbols 2 and 3 1016 of the first slot and may perform CB-basedcombination of retransmitted data on the basis of a subsequentlyreceived indication, thereby obtaining additional gain. Particularly, tofit a long PUCCH timing (slot n+2) for HARQ feedback transmission to acell-edge UE, the following conditions may be considered.

1. Bundling ACK/NACK in One PUCCH Resource (Latest Allocated)

Upon receiving the first control channel transmission (HARQ ID=#0,allocation HARQ PUCCH resource #0) from the base station and the secondtransmission (HARQ ID=#0, allocation HARQ PUCCH resource #0) includingthe retransmission, the UE may decode received information and maytransmit an ACK/NACK message pertaining to whether decoding issuccessful. When a resource allocated for feedback is one bit, anACK/NACK pertaining to whether decoding is successful may betransmitted. When the resource is two bits or more, an ACK/NACK may betransmitted in CB units or a set of CBs. PUCCH resource allocation maybe performed implicitly or explicitly.

2. Multiplexing

Upon receiving the first control channel transmission (HARQ ID=#0,allocation HARQ PUCCH resource #0) from the base station and the secondtransmission (HARQ ID=#0, allocation HARQ PUCCH resource #1) includingthe retransmission, the UE may decode received information and maytransmit an ACK/NACK message pertaining to whether decoding issuccessful. When each allocated resource is one bit, it is possible tosupport two-bit multiple feedback by combining feedback information ineach PUCCH resource. PUCCH resource allocation may be performedimplicitly or explicitly.

3. Channel Selection

Upon receiving the first control channel transmission (HARQ ID=#0,allocation HARQ PUCCH resource #0) from the base station and the secondtransmission (HARQ ID=#0, allocation HARQ PUCCH resource #1) includingthe retransmission, the UE may decode received information and maytransmit an ACK/NACK message pertaining to whether decoding issuccessful. When each allocated resource is one bit, the UE may transmitan ACK/NACK selectively using each resource. Here, the UE may select theresource allocated for the second transmission. In addition, the UE maytransmit an ACK/NACK through the selected resource in accordance withthe decoding result according to a preset rule.

FIG. 11 illustrates a method of transmitting and receiving feedbackinformation for supporting a plurality of services according to anotherembodiment of the disclosure.

Referring to FIG. 11 , a base station may transmit downlink datascheduling information and ACK/NACK timing information related theretothrough a downlink control channel of a first slot. In the embodiment,an ACK/NACK timing may be an uplink control channel 1154 after twoslots.

In addition, a resource for a URLLC service may be allocated in symbols2 and 3 1116 of the first slot. Information about this resourceallocation may be transmitted to a UE through reference numeral 1120 or1140. In this case, a UE receiving an eMBB service cannot receive datavia symbols 2 and 3 1116 and may determine whether to perform decodingon the basis of data received through symbol 4 1118. According to theembodiment, the UE may transmit an ACK/NACK in CB units and may wait forretransmission.

The UE receiving identification information through reference numeral1120 or 1140 may perform at least one of retransmission reception andfeedback transmission on the basis of the identification information.

The UE may receive data, which the UE failed to receive due topuncturing in the previous operation, through symbols 1 and 2 1136 of asecond slot, and may receive additionally allocated data through symbol4 1139. The UE may perform decoding on the basis of retransmitted data.Subsequently, the UE may transmit an ACK/NACK 1156 according to thedecoding result at the timing of the ACK/NACK 1056 through an uplinkcontrol channel of symbol 6 1154 of a third slot.

In the embodiment, when the UE is scheduled to transmit an explicit HARQsignal in an n+2th slot, the base station and the UE may operate asfollows.

First, when a certain number or greater of CBs or RBs are punctured, thebase station may perform corresponding retransmission immediately at thetime when reallocation is possible (the next slot in the embodiment)rather than waiting for the HARQ timing of the UE. Here, the foregoingindication may be used to indicate whether puncturing applies.Immediately retransmitted data packets may overlap an ACK/NACKtransmission timing scheduled in a previous transmission. In oneembodiment, the slot may be included in an uplink resource forsupporting like coverage.

Here, the foregoing indication may be used to indicate whetherpuncturing applies, and an HARQ ID and a PUCCH resource according to theoperation of the base station may be configured as follows.

1. The base station may perform first transmission to the UE using HARQID #0 and allocation HARQ PUCCH resource #0 and may perform secondtransmission including retransmission using HARQ ID #0, allocation HARQPUCCH resource #0, HARQ ID #1, and allocation HARQ PUCCH resource #0.Further, the foregoing indication may transmit the HARQ ID and the PUCCHresource. The indication may be common DCI or UE-specific DCI.

2. The base station may perform first transmission to the UE using HARQID #0 and allocation HARQ PUCCH resource #0 and may perform secondtransmission including retransmission by differently allocating HARQ ID#0, allocation HARQ PUCCH resource #0, HARQ ID #1, and allocation HARQPUCCH resource #1. The indication may be common DCI or UE-specific DCI.

According to the UE operation, the UE may identify failure of receptionin symbols 2 and 3 1116 of the first slot and may perform CB-basedcombination of retransmitted data on the basis of a subsequentlyreceived indication, thereby obtaining additional gain. Particularly, tofit a long PUCCH timing (slot n+2) for HARQ feedback transmission to acell-edge UE, the following conditions may be considered.

1. Bundling ACK/NACK in One PUCCH Resource (Latest Allocated)

Upon receiving the first control channel transmission (HARQ ID=#0,allocation HARQ PUCCH resource #0) from the base station and the secondtransmission (HARQ ID=#1, allocation HARQ PUCCH resource #0) includingthe retransmission, the UE may decode received information and maytransmit an ACK/NACK message pertaining to whether decoding issuccessful. When an allocated resource is one bit, an ACK/NACK may betransmitted pertaining to whether decoding is successful. When theresource is two bits or more, an ACK/NACK may be transmitted in units ofa CB or a set of CBs. PUCCH resource allocation may be performedimplicitly or explicitly.

2. Multiplexing

Upon receiving the first control channel transmission (HARQ ID=#0,allocation HARQ PUCCH resource #0) from the base station and the secondtransmission (HARQ ID=#1, allocation HARQ PUCCH resource #1) includingthe retransmission, the UE may decode received information and maytransmit an ACK/NACK message pertaining to whether decoding issuccessful. When each allocated resource is one bit, it is possible toseparately transmit an ACK/NACK via each resource or to support two-bitmultiple feedback (00, 01, 10, and 11 are separately interpreted) bycombining ACK/NACKs. PUCCH resource allocation may be performedimplicitly or explicitly. In the embodiment, two-bit multiple feedbackmay be interpreted differently depending on the embodiment.

3. Channel Selection

Upon receiving the first control channel transmission (HARQ ID=#0,allocation HARQ PUCCH resource #0) from the base station and the secondtransmission (HARQ ID=#1, allocation HARQ PUCCH resource #1) includingthe retransmission, the UE may decode received information and maytransmit an ACK/NACK message pertaining to whether decoding issuccessful. When each allocated resource is one bit, the UE mayselectively transmit an ACK/NACK. Here, the UE may select the resourceallocated for the second transmission. In addition, the UE may transmitan ACK/NACK through the selected resource in accordance with thedecoding result according to a preset rule.

FIG. 12 illustrates a method of transmitting and receiving feedbackinformation for supporting a plurality of services according to stillanother embodiment of the disclosure, and FIG. 13 illustrates a methodof transmitting and receiving feedback information for supporting aplurality of services according to yet another embodiment of thedisclosure.

FIG. 12 and FIG. 13 illustrate the case in which a base station maytransmit a signal to a UE and scheduling is established such that the UEbasically transmits an explicit HARQ signal to the base station in ann+1th slot. Specifically, FIG. 12 illustrates an HARQ feedback processfor a self-contained UE, and FIG. 13 illustrates an HARQ feedbackprocess for a non-self-contained UE.

Referring to FIG. 12 , a base station may transmit downlink datascheduling information and ACK/NACK timing information related theretothrough a downlink control channel of a first slot 1210. In theembodiment, an ACK/NACK timing may be an uplink control channel 1250 ofa second slot 1230 after one slot. This embodiment may be performed in aself-contained UE in order to decode retransmitted data after one slotand to transmit an ACK/NACK in the same slot, but is not limitedthereto.

Referring to FIG. 13 , a base station may transmit downlink datascheduling information and ACK/NACK timing information related theretothrough a downlink control channel of a first slot 1310. In theembodiment, an ACK/NACK timing may be an uplink control channel 1342 ofa second slot 1330 after one slot. The embodiment of FIG. 13 discloses atiming relationship that can be established in a non-self-contained UE,in which case an ACK/NACK of retransmission cannot be transmitted in theuplink control channel 1342 of the second slot 1330, and thus the UE mayreceive information related to a separate ACK/NACK timing in a downlinkcontrol channel 1332 of the second slot and may transmit an ACK/NACK ofretransmission in an uplink control channel 1352 of a third slot 1350 inresponse.

In the embodiment, according to the operation of the base station, whena certain number or greater of CBs or RBs is punctured for providing aURLLC service with respect to a UE receiving a particular eMBB servicein a particular slot, the base station may transmit informationindicating whether to perform retransmission immediately to the UE, asindicated by reference numeral 1220, 1240, 1320, or 1340, at the timewhen reallocation is possible (the next slot in the embodiment) ratherthan waiting for the HARQ timing of the UE.

As illustrated in FIG. 12 , the base station may perform downlink datatransmission to the UE in a first slot 1210 using HARQ ID #0 andallocation HARQ PUCCH resource #0 and may perform second transmission1236 and 1238 including retransmission by repeatedly allocating HARQ ID#0 and allocation HARQ PUCCH resource #0. In this case, once only an NDIis toggled without any indication, the UE may flush a buffer associatedwith data received in the first slot and may perform decoding inresponse to the retransmission. Further, the foregoing indication maytransmit the HARQ ID and the PUCCH resource. The indication may becommon DCI or UE-specific DCI.

Further, in FIG. 12 , the base station may perform downlink datatransmission to the UE in the first slot 1210 using HARQ ID #0 andallocation HARQ PUCCH resource #0 and may perform second transmissionincluding retransmission by differently allocating HARQ ID #0 andallocation HARQ PUCCH resource #1. In this case, the UE may transmit thedecoding result in response to the retransmission through PUCCH resource#1 and may transmit a feedback result through a resource selected fromamong #0 or #1 on the basis of the decoding result.

As illustrated in FIG. 13 , the base station may perform downlink datatransmission to the UE in a first slot 1310 using HARQ ID #0 andallocation HARQ PUCCH resource #0 and may perform second transmissionincluding retransmission by differently allocating HARQ ID #0 andallocation HARQ PUCCH resource #1 of a next slot 1330. Here, if anindication is transmitted together, an HARQ ACK/NACK timing may bedetermined in an implicit manner, or a retransmission timing may bedetermined through separate information transmission. In one embodiment,even though a default HARQ ACK/NACK timing is preset, the very next slotmay be determined as the timing, instead of the preset value, afterretransmission. A retransmission timing may also be determined withoutexplicit signaling, and an ACK/NACK 1354 of retransmission may betransmitted through an uplink control channel 1352 in the very next slot1350 in the embodiment.

Also, according to the UE operation, the UE may identify failure ofreception in symbols 2 and 3 1216 and 1316 of the first slot and mayperform CB-based combination of retransmitted data on the basis of asubsequently received indication, thereby obtaining additional gain.Particularly, to fit a long PUCCH timing (slot n+2) for HARQ feedbacktransmission to a cell-edge UE, the following conditions may beconsidered.

In FIG. 12 , as described above in the embodiments, an ACK/NACK 1252 ofretransmission may be transmitted in an uplink control channel 1250 ofthe second slot 1230.

In the embodiment of FIG. 13 , the UE may transmit an NACK in an uplinkcontrol channel 1342 of an N+1th slot 1330 or may not perform anytransmission operation (DTX).

Further, in FIG. 13 , the UE may perform decoding and ACK/NACKtransmission using a CB4 Nth slot and a CB3 N+1th slot in an N+2th slotin initial transmission and retransmission.

In the embodiments of FIG. 12 and FIG. 13 , as in FIG. 11 , additionaldata may also be allocated at the retransmission time, in which case anoperation similar to that in FIG. 11 may be performed.

According to the embodiment, it is possible to effectively transmit datausing different types of service in a communication system. In addition,the embodiment may provide a method enabling the coexistence of datatransmission of heterogeneous services, thereby satisfying therequirements of each service and reducing a delay in transmission timeor enabling the efficient use of at least one of frequency-timeresources and spatial resources. Also, it is possible to reduce theusage of an HARQ buffer memory of a UE using additional base stationsignaling before transmitting an HARQ ACK/NACK message.

FIG. 14 illustrates a UE according to an embodiment of the disclosure.

Referring to FIG. 14 , the UE 1400 according to the embodiment includesa transceiver 1410, a storage unit 1420, and a controller 1430.

The transceiver 1410 may transmit and receive signals to and from a basestation.

The storage unit 1420 may store at least one of information associatedwith the UE 1400 and information transmitted and received through thetransceiver 1410.

The controller 1430 may control the operation of the UE 1400 and mayperform overall control of the UE to perform operations of the UEdescribed above in the embodiments. The controller 1430 may include atleast one processor.

FIG. 15 illustrates a base station according to an embodiment of thedisclosure.

Referring to FIG. 15 , the base station 1500 according to the embodimentincludes a transceiver 1510, a storage unit 1520, and a controller 1530.

The transceiver 1510 may transmit and receive signals to and from a UEand other network entities.

The storage unit 1520 may store at least one of information associatedwith the base station 1500 and information transmitted and receivedthrough the transceiver 1510.

The controller 1530 may control the operation of the base station 1500and may perform overall control of the base station to performoperations of the base station described above in the embodiments. Thecontroller 1530 may include at least one processor.

Although the embodiments have been described on the basis of downlinktransmission, these embodiments may also be similarly applied to uplinktransmission.

Although exemplary embodiments of the disclosure have been shown anddescribed in this specification and the drawings, they are used ingeneral sense in order to easily explain technical contents of thedisclosure, and to help comprehension of the disclosure, and are notintended to limit the scope of the disclosure. It is obvious to thoseskilled in the art to which the disclosure pertains that other modifiedembodiments on the basis of the spirits of the disclosure besides theembodiments disclosed herein can be carried out.

What is claimed is:
 1. A method of operating a user equipment (UE) forcommunication in a mobile communication system, the method comprising:receiving a radio resource control (RRC) message from an externaldevice; based at least in part on the RRC message, identifying thatradio resources for downlink with respect to the UE are to be allocatedin a first region included in a plurality of regions; based at least inpart on the RRC message, identifying information for preemptionindicating that at least part of the first region is to be preempted;receiving a first Physical Downlink Control Channel (PDCCH) including afirst downlink control information (DCI) in a first portion of the firstregion; receiving a Physical Downlink Shared Channel (PDSCH) including adownlink data based at least part on the first DCI; receiving a secondPDCCH including a second DCI in a second portion of the first regiontransmitted later than the first portion; and identifying that at leastpart of the PDSCH is preempted based at least in part on the second DCI.2. The method of claim 1, wherein the identifying of the portion of thePDSCH is performed based at least part on the information for preemptionincluded in the RRC message, the information for preemption relating toa resource size in a time domain.
 3. The method of claim 1, wherein theplurality of regions further includes a second region, the first regioncorresponding to a first bandwidth and the second region correspondingto a second bandwidth.
 4. The method of claim 1, wherein at least partof the PDSCH is preempted such that the portion of the PDSCH isallocated for a first service configured to provide a high-speed orbroadband data communication, and another portion of the PDSCH largerthan the portion is allocated for a second service configured to providea low-latency or high-reliability communication.
 5. The method of claim1, wherein the first DCI includes unit information for performingfeedback with respect to the PDSCH.
 6. The method of claim 1, furthercomprising: decoding the PDSCH based on the second DCI.
 7. The method ofclaim 1, further comprising: generating feedback with respect to thePDSCH based at least in part on the unit information; and transmittingthe feedback to the external device.
 8. An electronic device comprising:a transceiver; and a controller configured to: receive a radio resourcecontrol (RRC) message from an external device; based at least in part onthe RRC message, identify that radio resources for downlink with respectto the UE are to be allocated in a first region included in a pluralityof regions; based at least in part on the RRC message, identifyinformation for preemption indicating that at least part of the firstregion is to be preempted; receive a first Physical Downlink ControlChannel (PDCCH) including a first downlink control information (DCI) ina first portion of the first region; receive a Physical Downlink SharedChannel (PDSCH) including a downlink data based at least part on thefirst DCI; receive a second PDCCH including a second DCI in a secondportion of the first region transmitted later than the first portion;and identify that at least part of the PDSCH is preempted based at leastin part on the second DCI.
 9. The electronic device of claim 8, whereinidentifying of the portion of the PDSCH is performed based at least parton the information for preemption included in the RRC message, theinformation for preemption relating to a resource size in a time domain.10. The electronic device of claim 8, wherein the plurality of regionsfurther includes a second region, the first region corresponding to afirst bandwidth and the second region corresponding to a secondbandwidth.
 11. The electronic device of claim 8, wherein at least partof the PDSCH is preempted such that the portion of the PDSCH isallocated for a first service configured to provide a high-speed orbroadband data communication, and another portion of the PDSCH largerthan the portion is allocated for a second service configured to providea low-latency or high-reliability communication.
 12. The electronicdevice of claim 8, wherein the first DCI includes unit information forperforming feedback with respect to the PDSCH.
 13. The electronic deviceof claim 8, wherein the processor is further configured to decode thePDSCH based on the second DCI.
 14. The electronic device of claim 8,wherein the processor is further configured to: generate feedback withrespect to the PDSCH based at least in part on the unit information; andtransmit the feedback to the external device.
 15. A non-transitorycomputer-readable medium storing instructions that, when executed by oneor more processors, cause the one or more processors to performoperations comprising: receiving a radio resource control (RRC) messagefrom an external device; based at least in part on the RRC message,identifying that radio resources for downlink with respect to the UE areto be allocated in a first region included in a plurality of regions;based at least in part on the RRC message, identifying information forpreemption indicating that at least part of the first region is to bepreempted; receiving a first Physical Downlink Control Channel (PDCCH)including a first downlink control information (DCI) in a first portionof the first region; receiving a Physical Downlink Shared Channel(PDSCH) including a downlink data based at least part on the first DCI;receiving a second PDCCH including a second DCI in a second portion ofthe first region transmitted later than the first portion; andidentifying that at least part of the PDSCH is preempted based at leastin part on the second DCI.
 16. The non-transitory computer-readablemedium of claim 15, wherein the identifying of the portion of the PDSCHis performed based at least part on the information for preemptionincluded in the RRC message, the information for preemption relating toa resource size in a time domain.
 17. The non-transitorycomputer-readable medium of claim 15, wherein the plurality of regionsfurther includes a second region, the first region corresponding to afirst bandwidth and the second region corresponding to a secondbandwidth.
 18. The non-transitory computer-readable medium of claim 15,wherein at least part of the PDSCH is preempted such that the portion ofthe PDSCH is allocated for a first service configured to provide ahigh-speed or broadband data communication, and another portion of thePDSCH larger than the portion is allocated for a second serviceconfigured to provide a low-latency or high-reliability communication.19. The non-transitory computer-readable medium of claim 15, wherein thefirst DCI includes unit information for performing feedback with respectto the PDSCH.
 20. The non-transitory computer-readable medium of claim15, wherein the operations further comprising: decoding the PDSCH basedon the second DCI.
 21. The non-transitory computer-readable medium ofclaim 15, wherein the operations further comprising: generating feedbackwith respect to the PDSCH based at least in part on the unitinformation; and transmitting the feedback to the external device.